Wireless Device and Antenna System with Extended Bandwidth

Patent metadata

Field	Value
Publication number	US-2017358848-A1
Application number	US-201715621792-A
Country	US
Kind code	A1
Filing date	Jun 13, 2017
Priority date	Jun 13, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

A wireless device comprises a radiating structure that comprises a ground plane layer etched on a PCB, including a clearance area nearby one edge of the PCB, and an antenna element mounted on the clearance area. The radiating structure is included in a radiating system that also includes a radiofrequency system comprising at least a matching network, including more than three components. The radiofrequency system connects the antenna element to a feeding line connected at its end to an external port. The antenna element features a maximum length within the 22-30 mm range to match the radiating system in the multiple frequency bands of operation. In general, a radiating system features extended bandwidth, typically including LTE700 bands or below. The antenna element may include two conductive adjacent surfaces with a convex shape connected between them.

First claim

What is claimed is:

1 . A wireless device comprising a radiating system that covers multiple frequency bands allocated in at least a first frequency region and a second frequency region, the radiating system comprising:
a radiofrequency system comprising at least a matching network that provides impedance matching to the radiating system at the multiple frequency bands; an external port; and a radiating structure comprising:
an antenna element connected to a feeding line through the radiofrequency system;
at least a ground plane layer; and
a first internal port defined between a connection point of the antenna element and a first connection point of the ground plane layer,
wherein a maximum length of the antenna element is shorter than L/12 but longer than L/22, where L is the free-space wavelength corresponding to a lowest frequency related to a lowest frequency region of operation.

2 . The wireless device of claim 1 , wherein the antenna element features a maximum length within the 22 mm to 30 mm range, the wireless device operating at a first low-frequency region ranging from 698 MHz to 960 MHz.

3 . The wireless device of claim 1 , wherein a ratio between the lowest frequency of the second frequency region and the highest frequency of the first frequency region is greater than 1.2.

4 . The wireless device of claim 1 , wherein the antenna element includes one or more conductive layers featuring a simple contour shape characterized by a complexity factor F12 below 1.25.

5 . The wireless device of claim 4 , wherein the contour features a rectangular shape.

6 . The wireless device of claim 4 , wherein the antenna element includes a first large convex area adjacent to a second smaller convex area.

7 . The wireless device of claim 4 , wherein the antenna element is placed on a ground clearance contained in the ground plane layer, the antenna element being combined with a conductive trace that connects it to the ground plane layer.

8 . The wireless device of claim 7 , wherein a combined contour of the conductive trace together with the antenna element features a low complexity factor F 12 below 1.25.

9 . The wireless device of claim 1 , wherein the radiating system comprises two or more ground plane layers.

10 . The wireless device of claim 9 , wherein the ground plane layers are electrically interconnected one to each other.

11 . The wireless device of claim 1 , wherein the radiofrequency system comprises a matching network that includes a plurality of stages comprising one or more circuit components, the stages being connected in series or in parallel with each other.

12 . The wireless device of claim 1 , wherein:
the radiating structure, when disconnected from the radiofrequency system, features a first resonance frequency at a frequency higher than the highest frequency of the first frequency region, measured at first the internal port; and a ratio between the first resonance frequency and a highest frequency of the first frequency region is greater than 1.5.

13 . The wireless device of claim 1 , wherein:
the radiating structure, when disconnected from the radiofrequency system, features a first resonance frequency at a frequency higher than the highest frequency of the first frequency region, measured at first the internal port; and a ratio between the first resonance frequency and a lowest frequency of the first frequency region is greater than 1.8.

14 . The wireless device of claim 1 , wherein:
the radiating structure, when disconnected from the radiofrequency system, features a first resonance frequency at a frequency higher than the highest frequency of the second frequency region, measured at first the internal port; and a ratio between the first resonance frequency and the highest frequency of the second frequency region is greater than 1.1.

15 . The wireless device of claim 1 , wherein the radiating structure features a first resonance frequency placed within the 1200 MHz-1650 MHz frequency range, measured at the first internal port when the radiating structure is disconnected from the radiofrequency system.

16 . The wireless device of claim 1 , wherein the radiating system features an impedance bandwidth in the first frequency region greater than 20% and in the second frequency region greater than 40%.

Assignees

• Fractus Antennas Sl

Inventors

• Andujar Linares Aurora
• Anguera Pros Jaume

Classifications

• H01Q5/335

  at the feed, e.g. for impedance matching · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q9/0421

  with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence) · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01Q5/40

  Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements · CPC title